Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857738ba7e04a0fe835474ffe53211f27a6ee854a42f55e365922657fa7bae7a' 
  AND token = '5Hwu+WwwWoBFFwJhqch7KHg0jF0HiOeWsP1Mn5MQGtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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