Php match serial from mysql and limit result to 1 row found or not

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PHP

MySQL

I have a script to match serial number from MYSQL, if the exact string is found it will shows 1 multiple results but if is not found it will echo multiple results too and I was wondering how can I echo just 1 result if found or not found?

What I have tried:

<pre>
	<form action="<?php echo htmlspecialchars($_SERVER[" PHP_SELF "]); ?>" method="post">
		Keyword: <input name="serialnumber" type="text" size="10">
		<input type="submit">
	</form>


	<?php

	if ( !empty( $_POST ) ):

		$serial = htmlspecialchars( $_POST[ "serialnumber" ] );

$con=mysqli_connect("website.com","serials@website.com","ZyHbxSsdfsUY5Y","raspled_wordpress");

if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$result = mysqli_query($con,"SELECT * FROM wp_lic_key_tbl");

while($row = mysqli_fetch_assoc($result))
{
	
$serial2 = $row['license_key'] ;

mysqli_close($con);

if(strpos($serial, $serial2) !== false){
    echo "<div align='center'><h1>Serial Found!</h1></div>";


} else{
    echo "<div align='center'><h1>Serial not Found!</h1></div>";

  }
}
endif;

?>