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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a4ec7eb30a0a02ed665c96a3a411906ee9bda1746db666ce2de656e1a278ce6' 
  AND token = 'MdafJw+LsWHY90T7ww4UOIXmdSpeJviiku5d+gu1ttE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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