Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f2efc431081ea139caac128495af9fd2dcc949fcb76af50940fc01c06bc1499' 
  AND token = '2H9nfxzWp8D1Q72Kr3ijXbZQrTcS0TzoKEXS3ShiPb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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