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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92d03991af361c67a2b6a9e3460c92e541c5b7b230a75b78bdf40c196a0bbbd5' 
  AND token = 'FUAYqN5V9ppVoAHlIrGkrd59C6WCEvLAbYSg9pJ8RqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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