Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733c4f4e2b03a583c0b985d365d8f984f5d0abb0260b4d46aeb810062f1edc29' 
  AND token = 'dxk8SRrrR5BMQoOxljIYSVrRg+1QotcGudoPfX5Z9jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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