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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7706b5d3caa7ad809ab9813fef22f617d9459a107411ee5f386023ca577b1e9f' 
  AND token = 'TjRBuddzAuBN7IZel00QYpYOy3iJ6NyWtai1mpjz5K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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