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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '97ffa9de8640563c579c541195a9288ee7e0ec8cec9083c7721f60a569198ceb' 
  AND token = 'ecKRzVS1hM4mww7UYnM9pfda6qI3/j1QQmqwrVHy2hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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