I have a table called filesUploaded, with a column called dataTimer of type
strtotime(date("Y-m-d H:i:s"));//Example: 145879957
DELETE FROM filesUploaded WHERE dataTimer < (NOW() - INTERVAL 5 MINUTE)
the issue is your storing it in the format of varchar .
you need to convert it to date format and the you can delete
DELETE FROM filesUploaded WHERE STR_TO_DATE(dataTimer,%Y-%m-%d %H:%M:%S) < (NOW() - INTERVAL 5 MINUTE)