Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42578466da8052fc8493e2464592a7476ace8d6bbcb6c44ff864693ae7c7481b' 
  AND token = 'n1AMQh2TO5Edk6xCZj4snNru0jaWVrJqUXl/XvO5hgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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