SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eebd8be37fb5b139614747f8834118efa22051b40cb349a4506bd888f3d6c361' 
  AND token = 'FXQ3Hk0vlXWIyzlUE1wq/4ieAQFq9YpchECNUyQmGJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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