Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52176a6b58d0a7be2d8f6a0e85fa4e70fa7ce9df34b63d582d2e5fd6b069cb29' 
  AND token = 'rj9IJhyOxk+ekdmwjNj64wC5sgDgSJSndilN8+IYW6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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