Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a88b8ee92d6af6d74a5145ee4c9264292adf1dec4df29ea562b9d73cbdd5bdc' 
  AND token = '43JaWlOYDlxJmsXaYCW1eeqKBMHGrDryj3CqYkMMIWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}