Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65e73de79868c1f85623c4e54c2ca659a58a4d095e7d0db13bbe7a7acc968d49' 
  AND token = 'xRxiVmCOtIK5Moh0dJTatmyGgclGJ0ZOgbZ4EvWneqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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