Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804c2cdbbcab0438047ef482360ff90ea17350f015de6acd531b75de3bf9e2ca' 
  AND token = 'BTudmdaP7WlC/Nh9zFAOBoOvv+638qJEbCjhhjnN9m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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