Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8cfc6a890bc4db4efab73ee0f2ae9bb4f2662eb6fffab47cbaf6138908169b' 
  AND token = 'zR5zkCEmE0KQiMABPZ2UEtb50UhrMiQloKWjLgE1XtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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