Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f313543424550972724332fdb460c4270df73b864db0b08384cffa931941aa' 
  AND token = 'fw5UAe4wabvUsSMzN5iSahDk2hVc3ONYp53848wl8QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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