Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66cc9a74979ee09d1e4d9f3902c6be3119d46952250eb2a3c7d0e75ed388c45d' 
  AND token = 'KsqXi1obR1D0sk6U/eagyVcSgOD5gWDcraiXQAVppLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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