Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff2661f7d5f9739ca0d328f3dcdd6a94aa60b309d7b41c0cafcca8979ff4662' 
  AND token = 'pzxQuBrKKrwUwAn+lZvcNeeonmMttYB5EvO/PC6nx/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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