Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7439e58ccabb17a618d1d73bbcfb0e05edcf1dc4da4a3403e2722ce4b6c03c' 
  AND token = 'bcgcsIMn150Czfg18PoZxBx1BXGzNKDFCUPrSkpm5Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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