Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd89ee884375dc0b46609201224996239036970ebe26ade87f11d8dbe364515b' 
  AND token = 'kM1QR/1FSLiRPTP6CZXt59cuAwgS3wlWUvXLcgH6lAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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