Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '87e8775a663fbbed4e92c339003f3dbce77db0f9f75d06bb7e77014f7e051af6' 
  AND token = 'Ke1Lvc1YqPkKEeeoDBFoKBkz21KPKJsrzo2+5d+MP2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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