Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6db9ba132bc296d5471e3723f8eaf10e097df5a9c39cb0e73cf2413ccc7a47' 
  AND token = 'MfwgJY2XhldIb3c4bbMgj8XIReyOU+aAGo+7VU/mK6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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