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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa5ced7ea02149751e6ddbfe0db2b6130a613a0b899e47c85c564ee6804bac56' 
  AND token = 'iuRZe5T44AU+mvweZBtDpdh2xqrYYmOId8S5B7Q44Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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