Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbc5126b1cdd1ecb17490d80405a2848fbba394b4f2528840a57e5d27080185' 
  AND token = '61FLg+A9+3Gd+FdDHj8pqyNmUW/6CRh/0uZkDwj3Pp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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