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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b31fc95643feb6ee072dfcfba83e6a8401e609b6fb9e91363427bfcfa372011' 
  AND token = 'RgKFnVXmj1RGYSwZT2k2z5pOoPrvWuMtmKfutc5MbkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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