Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2ce988e32bc77f0ac9367ba569d924f1a856cbbd83b6bab5d5188bbe3c51e2' 
  AND token = '0NybdskQQTTf5TpgxmZkK+0cBPVr4MSjaRy6ttBq/e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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