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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8323a69d46d766180bae670514da91b434e3f0e6436ea32b518a7479e92062dd' 
  AND token = 'Weeax0ElK7bRFFi0Gj5NBxAdcsep9PV3vNae9OhoSIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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