Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e04ebc7f559ff5c2f8343792cbdbee5eee8e56483c9d4a9f1ccc9d9284bf82' 
  AND token = 'YWVNgP5peM/tvI1SeBnePogtxCMFgKtyeHrVNN7Assw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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