Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1881dcf47224d5128da98c1e19e6a5ae3b9dda738f1c1ba1d6b79a57cf54ceed' 
  AND token = 'LxWkMWy9l3Di8wsPvp22aK1fVNcChadPjaZ0dkiLGfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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