Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd3dc66c4f2fb4377a538ec3dc8c623ca1a8125e0cf648c386a0fbcfbc13642' 
  AND token = 'x1oTGAJ5MqDNkZrRBSlofQEuFbTIlbWx+++EPy6z4bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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