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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd03382c94bc3899550af5304301edf652045d3ce8a33a95c85a71ef9218baf59' 
  AND token = 'lEOXasxUsDAQTpRkjz5Xs6gv0s53I3zrbUD/TxK1dnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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