Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f436fc4f0efa83c8057e1e3aeea018d3d0e47f2bf758b684dae1d9fe878388' 
  AND token = 'YsJZNnqZmIHqLdb2THg1oUkWcTKokOT7bk2Kof8quGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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