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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '68f1a15c80c829e5477c5383c198c438201d14c42ee10d7222847657d084587d' 
  AND token = 'fuNc04dBTnS+LZm0cXCZJGXeX9mCaCgfa6CHvg4tlAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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