Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f23f6c5583cbd1a56bdd6022b42ce669da73904395e098186b17fff489260cb' 
  AND token = '8uMV/KPzvKm38KRnHICdvtTXol+MNW9R05nTKtZHsCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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