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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d5a687a08c57e5aa8ff60503eda832a45f336b338820822d05dbb5bbd5000ae' 
  AND token = 'gPNw8EZ9h91k/jkfssLd1ywOLBEZLl8IE66Y7dr9TcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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