Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8e499e98a411e682ee5510baef4da18b7dde47f70e052d88e847dfce871889' 
  AND token = '/TRusncBQkGym6yhe4cZ1+cu8Qi2wWH1OK6LrGUU6/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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