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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ddb67d8c94f9a92f8bf76808585e77571d5c751ce70340e671f2d80aab4fafa' 
  AND token = 'qHkQoCbsPsKJO6Xu6Fwn7fu0bsHQr8WdS6eBc+jbJCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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