Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d748638417573a721e2e9377cf70b69f0bdda94d8ae24f4a47092a83a577681' 
  AND token = 'FGzm0LmX256DGA7WXQ812KvNceVMWi5fTiuDYkgRX8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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