Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4df82ddd047b1e55e3bef99764471f8ed2ef8416698c6569f44230f26e94f0' 
  AND token = '/ZHrsUK7lTvC7Br+lyFNmT273PZ0vUwINDl/pBfS9IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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