Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1751daec4fca596e00e4516fc4499191c3c718a87a85f17b343723cc9016c57d' 
  AND token = 'JMX5OkNDEhTh6EphdmLBYl6QkodFK8d3q8EIeMjQOdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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