Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a38f3f569a7dda70dd155f95d2ecc503bded009f3ebaebbdf8a110dc5bb00a4' 
  AND token = 'DIRiAb/kLEJtNP2NkXGqQfLQAGKlHb3TkzytWmlYspg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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