Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494fadf143efa0f051a4e59dfe020cd54cd5ccd83edb4c983f64c2357b618409' 
  AND token = 'dnZuiVhjoLF49VO1GiPgsEgqVzlUbHlOIDQFqu4/5xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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