Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b221f6a02012074979534c36a6cc34d5e0fc29a05a9901d91587bfe4dbd331d6' 
  AND token = 'k3nGAEQb/dX5XIePWGiCP7iaLxRLWrEd+fkA7c45/pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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