When creating any Custom Field with the ACF plugin, even if I do not add any value to it in a post, when doing a query via meta_key these posts that have no value are displayed.
For example, I create a post and in a meta_key I add an expiration date. If comparing this date and it is less than the current date, it automatically expires. It turns out that posts that I do not add expiration date, also expire, as they come up in query by meta_key with value zeroed.
What I want is for this worthless meta_key not to be part of the query. Is it possible?