Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3d5d8b2bdc1311e810afa3cfe667319c9078326a9e702971444ae1d7f64dc5' 
  AND token = 'f6SFjVzGVnmYFWRjW0aprl3JLFwFJWqfi/rhrI9tI70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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