Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9100d0ff61ab64f6e57cba06919227b75075bd46f0c00f2aa5c4038de07f1330' 
  AND token = 'nKK/Fm6sJFedNvl5wPxomP4bJMviPjtGs/mFzm/QY4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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