Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5ca99da5d03a04e76ac29d90ffcc5b2c0bd63b140acd0b5f4f1aa7c7bb4c53' 
  AND token = 'HaKysNA1/u94pLYeiEnoDI80h/JWMoJOGkXf0rLxPdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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