Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60563b457cd3de266a05ac8e31b383b3e0ecb0aea47b143d282e7bbbaeac4c' 
  AND token = 'WsjlhKuf7bjErFfh8Ig3RE6Wrjw2WgL7gCj9BTplVJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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