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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06cefb4a3eb8a1395626bf992d8a4af9a69eac954b31809d4bcd0d4dde3d9249' 
  AND token = 'At0ib32eOqV9ul1LgiZOCHSvu+JGhEKOcF67HRT2G7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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