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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57bc54d7527ddd26ef64f7ba0be3fc0f320a424f2e9d2cae7ddf08ed93bb4fdb' 
  AND token = 'shjyMVaCirmXlXQ9p/1TT/J9it1ZrG/p/+z86fr2va0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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