Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82974c9b0796eb54533a5ee9da7aacc5dd829e6abe57d62fc76bbf5188ce305b' 
  AND token = 'yp8Vj4h1f4Sv1TSUIpU/WxaoYVpDC37wMCIT+ZxCuCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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