Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a5578fcdd3e05012a101c264d25d9f72763855d0904a7704f4e0a1837816bc' 
  AND token = 'jDzBCVUTlrPQ9KSdGo9GZgMyMa/4aj/GZkPalwlcki4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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