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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11424ac8bb7ae0dd4ff5a801aae7b8287d223d6381c175587d7a9b469efa9321' 
  AND token = 'hYEaHpUyRnYGC9ArvYW4V1Blu2kkHMBFWx7HyS357Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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