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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3de5476ab272530307f89b5175956e0504eb2f260b43c5cc2c4aeb1930173ae6' 
  AND token = 'lk/VCKwXG21PWLOQyZrKt3C0ZhrYbObWyOT9WCRl0FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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