UPDATE 
  cscart_multi_declock_keys 
SET 
  expiry_at = UNIX_TIMESTAMP(NOW()) + 30, 
  token = '6u0SWUPHUBYo3XtWLZTUp+9ADtOgCHZTzHt3xM7PW+8=' 
WHERE 
  key_id = '521642d991569a614e14a213bc6512df75247002697079e63aa5caccb07de9ea' 
  AND (
    token = '6u0SWUPHUBYo3XtWLZTUp+9ADtOgCHZTzHt3xM7PW+8=' 
    OR expiry_at <= UNIX_TIMESTAMP(NOW())
  )