Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b9de1bbc08ccceb6c1db2fee130f44f60cbb0d4446aca8e622da6e2a8c6a4a' 
  AND token = 'dR9wEzoWOIAfJsSTQ8Zi8zhkBQKd4gFFlZt0bdwGsjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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