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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef2338257cec9943927f050a2fd52ce9f9f6fa212920d8bee0099802e6058b85' 
  AND token = 'uBy2+7fD/oETxiTXsLa/8sMHRvkT3U5yD1na8zIruL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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