Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8ea0061f8471afe71d6f756908d15228e72b6dae277b0179b06a0b2417c8a6' 
  AND token = 'MKJyugPvZ5jJ89frjIzY7a6uIGaLuiphKjk7jiu1eZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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