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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98b9fc6d097197e3aa78f141d446bef5763083e535d7e792f745a5de595ca97f' 
  AND token = 'h2ZqC+jqX35ZMh60KTB3onFuBBbC/enGIUh9e5UCqMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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