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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0147145f78a9629fe0b42e49300cc1d85c8b35e73858ae79dd346c2a81adac2a' 
  AND token = 'lhDFRfOjetU/JRWEdaIywZu47CO7bqfg35Ur1Mt7egw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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