It is awkward keeping a date as three integers when a DATE datatype is available. Your $sql should work if you straighten out the quotes and use stringified values from columns in the date string:

$sql = q{SELECT *  FROM TTD
         WHERE
           TO_DAYS(CURDATE()) - 
           TO_DAYS(CONCAT_WS('-',YYYY,MM,DD)) <= ?};
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I've tossed in a placeholder, and assumed the obvious names for your integer date columns. Note how a datestring is built from your int columns.

After Compline,
Zaxo