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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47a6fad5fbb00b874bacfb326ad14fd64ba76d09ff515bef25ea073e7160d117' 
  AND token = 'daaT9nNCPRNmlxlpjLxJSXQA8I4TIUo00JaA7WloQuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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