Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533768419ce42c0dbc3985a36f319546368c54abcd60f762a2e6c76f9f9c4ccb' 
  AND token = '2JcwLXdWMFWOhcOl+lqRCeGuQbJlDbIdnSpyyDQiBhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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