Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c48ecdf3eb3a0227ebc730440282fd4fd3de6d4776e0f04b2bf0a4040d45a2' 
  AND token = 'ug6J/a2iQYHR2MbFO+pfPnwTfo0/YW01BB6U0hMIZb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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