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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'df47033fc22f8ad580899c0ea97bc9725624cd9c0178b83580ccf86449834181' 
  AND token = 'aNew6w396MykEbl/Bl1P8KY43xXK6ehFTRyAePW+ZeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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