Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593dc892fb78990cc478015e059465d6ff57a4835567d7b14372c60173335235' 
  AND token = 'y0Ghcryk7qj/y5BLt27Su7PDz6V8pI9gpFVe1tnY0Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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