Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f250d6be406fa5b9db391d8c10bb12301e57480d231aa251c358db4334b1f65' 
  AND token = '8gQMJ39D0vNFmrMTTf3dYHaqnHZME6Vb5QYVbpJFbxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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