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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3463eb45e3cb833cf7bb1ff10165370b33c5585e7a0eeff36fc67c90f8ec612a' 
  AND token = '176WEbFiH8obRCJSe46H/cS6IJr//GNf3QRU7CyRM2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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