MySQL значения временной метки по умолчанию, чтобы быть текущей временной меткой

CURRENT_TIMESTAMP

You can use two timestamp in one table. For default, use DEFAULT field first 
and then the rest timestamp fields.

Below query should work.

CREATE TABLE myTable 
(
 id INT,
 date_registered TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, 
 date_validated TIMESTAMP
);
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