Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9fee70dde296fec0630cbbd08771662afbbd47e43faba5ed9b3ec8a8577478' 
  AND token = '3tWi8K0rXxWBp8OhcHJN2LObWiSRq6SfDFbaBw74AyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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