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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e3d4557ade73bff8e1a37519e5858cf09429eb54e4e3fe213b3323fbe42ae888' 
  AND token = 'g7OApJgl8xaXpYhcgGUFt7orNyfsDKkmUs225aYCuuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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