Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e397f3425e551552d88e070c859e209f12f18fdf4860696a0bf7beeddfee7c5c' 
  AND token = 'iROt5VPDK3f4ZBth+POeeVGvwFxIxdWVof/5oox92mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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