Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2028a4654b1f298e555d9680a9bbdf8d7f148e1b1d9813f981f4819a068532' 
  AND token = 'SqBLysVgepqIYVHqOItKNJaWV9GU/eHqCbDyhe8LSeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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