Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcd96034196a679bd8db89aaf918df4c1474690935c5cfa70a103e5fd71f0b4' 
  AND token = 'sNSJpkTZJ1Gzmh6jAyUQkA+o1fNyXUqqtKDAejcaK0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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