Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bde326b67d72b930a441e569c0d3c3f5ef6f6f1fbed9396d9d8889f1e3f5aeb' 
  AND token = '2fr58m3yU+bOt0nsYrEiXQu/m79xWGZ5Y6rxtWjnhWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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